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by hi cap, I mean amp rating.

3.6v 1000mah is the same no matter what type of device it is running. I suggest cell phone batteries, because they are common, small and known to work well in various conditions.

really it could be any type of battery, all I wanted to do was spark some new ideas to ...

I never said that they were weightless, just that it was cheaper than the current selection of hi-cap batteries.


Ideally, using about 4 3.6v hi cap cell phone batteries should do the trick and be fairly lighter than most other battery pack solutions.


another suggestion, the system could be ...

Watts = Amps x Volts

considering that information, a higher voltage, would equate to higher wattage, when a battery is used the pressure drops until the voltage is below what is needed to run the device, if the device, is a 12 volt device, the usual battery when fresh, may be running at about 13 ...

why not get a higher voltage rechargable battery and use a step down converter, it should last a lot longer that way

you can build that yourself with radioshack parts.

Or you can buy something like this

http://www.powerstream.com/12V-backup.htm

I gotta admit the powerstream battery is a nice ...